芦苇湿地土壤有机碳和全氮含量的垂直分布特征

Vertical distribution of soil organic carbon and total nitrogen in reed wetland.

利用元素分析仪,测定了芦苇湿地不同层次土壤有机碳和全N的变化.结果表明,土壤有机碳、全N及C/N随土壤深度的增加呈下降趋势.对不同月份(7、8、9和10月)而言,有机碳、全N及C/N比累积峰位于不同的土层中.土壤温度、水分及芦苇生长状况是引起分异的重要因子.7、8和10月份芦苇湿地不同层次土壤有机碳与全N呈显著相关(R2=0.73、0.73、0.71),而9月份芦苇湿地不同层次土壤有机碳与全N之间的相关性相对较差(R2=0.41).土壤C/N与土壤有机碳、全N均呈负相关,但C/N与全N的相关性强于土壤有机碳,说明C/N的大小主要决定于全N含量.

With element analyzer, this paper measured the variation of organic carbon and total nitrogen in different soil depths of reed wetland. The results showed that soil organic carbon, total nitrogen, and C/N ratio were decreased gradually with increasing soil depth, and their accumulation peaks were differed with soil layers and months. Soil temperature and moisture and the growth status of reed were the main factors caused the differences. Soil organic carbon was strongly positively correlated with soil total nitrogen content in July, August and October, the R^2 being 0.73, 0.73 and 0.71 respectively, but weakly correlated in September. Soil C/N ratio was negatively correlated to soil organic carbon and total nitrogen, but the correlativity was higher with soil total nitrogen than with soil organic carbon, suggesting that soil C/N ratio was more determined by the content of soll total nitrogen.